Note: Copies of bank statement, criminal record, medical record and marriage certificate must be certified by a Notary Public officer or Solicitors in the uk who can sign this paperwork ,apart from a solicitor for a O. A visa
TLDR : Answer Summary
For the O.A. visa application in Thailand, specific documents like bank statements, criminal records, medical records, and marriage certificates must be certified by a Notary Public or Solicitors in the UK, excluding solicitors.